1. Which tissue in plants is primarily involved in the transport of water and minerals?
Answer:
Explanation:
Xylem is specialized for the transport of water and dissolved minerals from roots to various parts of the plant.
2. The primary driving force for the movement of water and minerals in the xylem is:
Answer:
Explanation:
Transpiration pull, due to the evaporation of water from leaves, is the major force driving the ascent of sap.
3. Osmosis is defined as the movement of:
Answer:
Explanation:
Osmosis specifically refers to the movement of water molecules across a semipermeable membrane.
4. Which process helps in the absorption of water by root hairs?
Answer:
Explanation:
Root hairs absorb water from the soil through osmosis.
5. The loss of water in the form of water vapor from the aerial parts of the plant is known as:
Answer:
Explanation:
Transpiration is the process by which plants lose water vapor mainly through the stomata.
6. Which of the following is not a type of transpiration?
Answer:
Explanation:
There's no type of transpiration known as "Radial transpiration". The main types are stomatal, cuticular, and lenticular.
7. The primary sugar transported by phloem is:
Answer:
Explanation:
Sucrose, a disaccharide, is the main sugar transported in the phloem.
8. Root pressure is a result of:
Answer:
Explanation:
Active transport of solutes into the xylem results in a water potential gradient that leads to the phenomenon of root pressure.
9. The opening and closing of stomata are regulated by the:
Answer:
Explanation:
Guard cells surrounding the stomata regulate their opening and closing, often in response to light and water availability.
10. The term 'plasmolysis' refers to:
Answer:
Explanation:
Plasmolysis occurs when a plant cell loses water causing the cytoplasm to shrink and detach from the cell wall.
11. The tissue responsible for transporting organic nutrients in plants is:
Answer:
Explanation:
Phloem transports organic nutrients, especially the sugars produced by photosynthesis, to different parts of the plant.
12. Which of the following is NOT a function of transpiration?
Answer:
Explanation:
While transpiration indirectly aids photosynthesis by maintaining water and nutrient flow, it does not assist photosynthesis directly.
13. The ascent of sap primarily involves:
Answer:
Explanation:
The ascent of sap, or the upward movement of water and nutrients, primarily occurs through the xylem.
14. In plants, water is mainly lost in the form of vapor from:
Answer:
Explanation:
Leaves, through stomata, are the primary sites of transpiration where water is lost in the form of vapor.
15. When a raisin is placed in a cup of pure water, it swells due to:
Answer:
Explanation:
Water moves into the raisin, causing it to swell, because of the osmotic gradient.
16. The pressure potential in a flaccid cell is:
Answer:
Explanation:
In a flaccid cell, there's no turgor pressure, making the pressure potential zero.
17. Which of the following facilitates the rapid movement of water through the cells of the root?
Answer:
Explanation:
The apoplast pathway involves the movement of water through the cell walls and intercellular spaces, allowing for rapid transport.
18. Guttation refers to:
Answer:
Explanation:
Guttation is a phenomenon where water droplets are released from the tips or edges of leaves due to root pressure.
19. Casparian strip is present in:
Answer:
Explanation:
The Casparian strip, made of suberin, is present in the endodermis of the root and acts as a barrier to passive flow of substances.
20. The primary role of root hairs in plants is to:
Answer:
Explanation:
Root hairs are extensions of root epidermal cells and significantly increase the surface area for absorption.